Emma P. Hocking
Modern diatom assemblages from Chilean tidal marshes and their application for quantifying deformation during past great earthquakes
Hocking, Emma P.; Garrett, Ed; Cisternas, Marco
Authors
Ed Garrett
Marco Cisternas
Abstract
Tidal marsh sediments from south-central Chile provide evidence for multiple great earthquakes. Diatom transfer functions, statistical models of the relationship between species preserved in the sediment and elevation, provide quantitative estimates of coseismic vertical land-level change associated with individual earthquakes. However, in south-central Chile, our ability to quantify land-level change is currently limited by a lack of understanding of the environmental variables controlling the distribution of diatoms, an essential prerequisite for converting variations in fossil diatom assemblages into quantitative estimates of past elevation changes. We present a new modern diatom dataset for the region and explore the implications of the scale of the dataset used in transfer function models on the reconstructions of land-level change. Modern training sets containing samples from a regional scale are superior to sub-regional and local-scale training sets, providing closer estimates for known deformation during the great 1960 Chilean earthquake, a higher proportion of good modern analogues and uncertainty terms up to 42% smaller than previously published reconstructions.
Citation
Hocking, E. P., Garrett, E., & Cisternas, M. (2017). Modern diatom assemblages from Chilean tidal marshes and their application for quantifying deformation during past great earthquakes. Journal of Quaternary Science, 32(3), 396-415. https://doi.org/10.1002/jqs.2933
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 8, 2016 |
Online Publication Date | Apr 3, 2017 |
Publication Date | Apr 3, 2017 |
Deposit Date | Apr 24, 2017 |
Publicly Available Date | Apr 25, 2017 |
Journal | Journal of Quaternary Science |
Print ISSN | 0267-8179 |
Electronic ISSN | 1099-1417 |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 32 |
Issue | 3 |
Pages | 396-415 |
DOI | https://doi.org/10.1002/jqs.2933 |
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Copyright Statement
Copyright © 2017 The Authors. Journal of Quaternary Science Published by John Wiley & Sons, Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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